Daikin Industries, Ltd.

Daikin Kogyo Co., Ltd.

Yohnosuke Ohsaka

Takashi Tohzuka

Shoji Takaki

Motonobu Kubo

Tsutomu Kobayashi

Yoshio Negishi

Yoshio Amimoto

Toshihide Honda

Uji Hiramatsu

Yoshitaka Honda

Satoru Kohno

Norio Yanagisawa

Heikitsu Sonoyama

Tsutomu Kobayashhi

Osamu Morimoto

Hiroo Sakai

A novel fluorine-containing aromatic compound of the formula: ##STR1## wherein X is ##STR2## in which R.sub.f is a perfluoroalkyl group having 1 to 10 carbon atoms, R.sub.f, is a perfluoroalkyl group having 1 to 12 carbon atoms, p is an integer of 1 to 3, q is an integer of 0 to 3, r is 0 or 1, s is an integer of 0 to 5 and t is an integer of 0 to 5,

Semiconductor device coated with a fluorena-containing polyiimide and a

A novel fluorine-containing aromatic compound of the formula: ##STR1## wherein X is ##STR2## in which R.sub.f is a perfluoroalkyl group having 1 to 10 carbon atoms, R.sub.f ' is a perfluoroalkyl group having 1 to 12 carbon atoms, p is an integer of 1 to 3, q is an integer of 0 to 3, r is 0 or 1, s is an integer of 0 to 5 and t is an integer of 0 to 5,

Fluorine-containing aromatic compound, process for preparing the same

A novel fluorine-containing aromatic compound of the formula: ##STR1## wherein X is ##STR2## in which R.sub.f is a perfluoroalkyl group having 1 to 10 carbon atoms,

A halogen-containing polyether comprising repeating units of the formula:

Halogen-containing polyether

A novel process for distillation of a mixture comprising 2,2,3,3-tetrafluorooxetane, which method comprises distilling the mixture comprising 2,2,3,3-tetrafluorooxetane in a metallic distillation column in the presence of at least one additive compound selected from the group consisting of an organic nitro compound and an aromatic compound.

Process for distillation of 2,2,3,3-tetrafluorooxetane

A process for purifying 2,2,3,3-tetrafluorooxetane which contains at least one impurity compound selected from the group consisting of hydrogen fluoride and trifluoropropionylfluoride, which process comprises contacting 2,2,3,3-tetrafluorooxetane with at least one adsorbent selected from the group consisting of silica gel and alumina and causing said impurity to be adsorbed on said particles to remove it from the 2,2,3,3-tetrafluorooxetane.

Process for purification of 2,2,3,3-tetrafluorooxetane

A fluorine-containing polyether of the formula:

Fluorine-containing polyether and process for preparing the same

By extracting hydrogen fluoride from 2,2,3,3-tetrafluorooxetane with a halogenated hydrocarbon, a mixture of 2,2,3,2-tetrafluorooxetane and the halogenated hydrocarbon containing a small amount of hydrogen fluoride is obtained. The mixture may be distilled at least twice to obtain a mixture of 2,2,3,2-tetrafluorooxetane and the halogenated hydrocarbon containing substantially no hydrogen fluoride.

Removal of hydrogen fluoride from 2,2,3,3-tetra-fluorooxetane

Chlorotrifluoromethylbenzene is prepared with a good yield by reacting chlorotoluene, hydrogen fluoride and chlorine in a gaseous phase in the presence of a catalyst selected from the group consisting of .alpha.-aluminum fluoride, .alpha.-aluminum fluoride carrying one or more salts of iron, bismuth, tin and lead, and chromium(III) oxide or partially fluorinated chromium(III) oxide carrying alkali metal fluoride.

Process for preparing chlorotrifluoromethylbenzene

A novel amine amide of the formula: ##STR1## wherein the various substituents are defined hereinbelow. The compounds are useful as thickening agents, disoxidation catalysts and monomers.

Fluorine-containing amine amides

2,2,3-trifluoropropionyl fluoride is prepared by opening the ring of tetrafluorooxetane in the presence of a catalyst. Analogously, a novel 2,2-difluoropropionic acid derivative of the formula:

2,2-difluoropropionic acid derivatives

A substituted trifluorooxetane of the formula: ##STR1## wherein R.sub.f is a C.sub.1 -C.sub.10 perfluoroalkyl group and n is 0, 1 or 2, which is useful as a solvent or a monomer.

Substituted trifluorooxetanes

A novel polyaminoamide of the formula: ##STR1## wherein R.sub.m and R.sub.m ' are, the same or different, a hydrogen atom or a monovalent organic group and A.sub.m is a divalent organic group, or R.sub.m and/or R.sub.m ' form a cyclic group together with A.sub.m and the nitrogen atom to which they are bonded. m changes from 1 to p (where p is a positive integer) and n.sub.m is a positive integer, which can be prepared by reacting a 2,2,3,3-tetrafluorooxetane of the formula: ##STR2## with m kind(s) of diamine(s) of the formula: ##STR3## wherein m is the same as defined above.

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Osaka, Japan

Yohnosuke Ohsaka